World 4 · Seeing the World: Sensors · 12 min · PRO
Echo timing
Ultrasonic sensors
PRO · Rover Lab
World 4: Seeing the World: Sensors is part of PRO
The first world of Rover Lab is free. PRO opens the other 26 lessons in 6 worlds — simulations, quizzes and all.
PRO includes
- All 60 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly